Space quiz

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Across
  1. 3. visible Part of the sun
  2. 4. discovered the laws of planetary motion
  3. 5. dark centre of a sunspot
  4. 6. alignment of three celestial bodies
  5. 7. sun's outermost region
Down
  1. 1. scientific term for twinkling of stars
  2. 2. radio source very far from earth
  3. 6. first to operate in the geostationary orbit